Support for implement retainers



Nov. 13, 1928. 1,691,694

w. F. ZIMMERMANN SUPPORT FOR IMPLEMENT RETAINERS Filed Jan. 28, 1928 INVENTOR. I15 21 1 amF Zzmznermwm TT EY mum 4 Patented Nov. '13, 1928.

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WILLIAM FRANK ZIDIIIVIERMANH, 0F V/AV NEW YORK, ASSIGNOR TO INGERSOLL RAND COMPANY, OF JERSEY CITY, NEVI A CORPORATION 0F JERSEY;.

SUPPORT FOR IMPLEMENT RETAINERS Application filed January 28, 1928. Serial No 250,249.

This invention relates to pneumatic tools, but more particularly to a support adapted to be threaded or otherwise secured on the cylinder of pneumatic tools for supporting an implement retainer.

The object of the invention is to enable the use on pneumatic tools, such as coal picks, of implement retainers of the type commonly used on rock drills for maintaining the drill steel in the drill.

Other objects will be in part obvious and in part pointed out hereinafter. I

' In the accompanying drawings taken in conjunction with the following description,

Figure 1 is an elevation of the front end of a pneumatic tool equipped with a support constructed in accordance with the practice of the invention,

Figure 2 is an elevation of a pneumatic tool, partly in section, illustrating more fully the manner in which the implement retainer is supported, and I Figure 3 is a transverse view taken through Figure 2 on the line 33 looking in the direction indicated by the arrows.

Referring to the drawings, A represents a cylinder of a pneumatic tool in which is disposed a reciprocatory hammer piston B adapted to deliver blows on a working implement 0 extending with its shank D into the cylinder A. A bushing E disposed in the front end of the cylinder forms a guide for the working implement. At the uncture of the body portion of the working implement C and the shank D is a collar F which abuts the front end of the tool to limit the distance which the shank D may extend into the cylinder A.

In accordance with the present invention, means are provided for forming a support for an implement retainer G of a well known type generally used on rock drills for maintaining the working implement in the drill. To this end the front end of the cylinder A is provided with exterior threads H for engagement with corresponding threads J formed in the front end of a sleeve K mounted on the cylinder A.

The sleeve K carries near its front end op positely disposed lugs L in which are formed grooves O to engage the side arms P of the retainer G for the purpose of maintaining the yoke Q, of the retainer in the retainingposition, that is, in a position to encircle the working implement at a point forwardly of the collar F for which it forms an abutment.

In order to enable the sleeve K to be clamped securely in operative position on the cylinder A, a'longitudinal. slot R is formed in the rearward end of the sleeve K and on opposite sides of the slot R are enlargements S. In one enlargement S is formed a plain cylindrical hole T and in the other enlargemnt a threaded aperture U. A bolt V is extended through the hole T and threaded into the aperture U for clamping the rearward end of the sleeve K securely to the cylinder. A nut W threaded on the end of the bolt V serves as a lock nut for preventing unscrewing of the bolt.

The bolt V and the nut W also serve as jivotal points or trunnions for the retainer an enlarged cylindrical portion X adjacent the head Y of the bolt to form a pivot for one side arm of the retainer and a similar cylindrical portion Z is formed on the nut W To this end the bolt .V is provided with to pivotally receive the other side arm P of aperture U to clamp the rearward end of the sleeve against the cylinder A. After these parts have been thus assembled the nut W may be threaded on the bolt V and the cylindrical portion Z of said nut will then engage the inner coil of the side arm through which it extends. I

In connection with the foregoing, it may be stated that tools ofth-e type to which the present invention is applied have heretofore been provided with sleeve retainers adapted to be threaded on the front end of the tool. These retainers have an aperture in their front end through which the tool extends. The disadvantage of'sleeve retainers, however, is that whenever it is desired to change the working implement it becomesnecessary to entirely unscrew the retainer; This obviously requires considerable time and causes unnecessary delays. The present invention entirely eliminates this objectionable feature and makes possible the instant Withdrawal of the retaining deviceon tools of this type to change the working implement in the same manner as is customary in rock drills emp y g eel etaine s I claim: I

I. The combination with a pneumatic tool y inder, hav n a too mo nted there and a retainer for the tool of a sleeve adapted to be disposed on the cylinder, means for clamping the sleeve to the cylinder, said means, forming a pivotal support for the implement retainer.

2. The combination with a pneumatic tool cylinder of a sleeve having internal threads at one end for threaded engagement with the cylinder, said sleeve having a longitudinal slot at one end, means extending through the sleeve adjacent the slot for clamping the sleeve on the cylinder and an implement re tainer pivoted to said last mentioned means. I 3. The combination with a pneumatic tool cylinder of a'sleeve having internal threads for threaded engagement with the cylinder,

through the holes for clamping one end of the sleeve to the cylinder, a nut on the bolt and unn on on the bolt an nut an an mplement retain r pivoted to said trunnion? 4. The combination with a pneumatic tool cylinder of. a sleeve having internal threads for threaded engagement with the cylinder, said sleeve having a longitudinal slot at one end and transverse holes on the same on opposite sides of the slot, a bolt extending through the holes for clamping one end of the sleeve to the cylinder, a nut on the bolt, trunnions on the bolt and nut and implement retainer pivoted to said trunnions and locks on the sleeve for looking the retainer in retaining position. r

In testimony whereof I have signed this specification.

WILLIAM FRANK ZIMMERMANN. 

